A steel support axial force multi -point synchronization applies device

Abstract

The invention discloses a device for applying force to multiple points of a steel supporting shaft synchronously. The device comprises a first oil way and a second oil way. The first oil way is formed by sequentially communicating a pump, a one-way valve, a plurality of electric proportional pressure reducing valves, a plurality of first three-position four-way valves, a plurality of hydraulic control one-way valves and a plurality of oil cylinders through oil ways; and each electric proportional pressure reducing valve, the corresponding first three-position four-way valve, the corresponding hydraulic control one-way valve and a back cavity of the corresponding oil cylinder are sequentially communicated through the corresponding oil way, and the pump is driven by a motor. The second oil way is formed by sequentially communicating a pump, a one-way valve, a second two-position two-way valve, a plurality of second three-position four-way valves and a plurality of motors through oil ways, wherein the two ends of each motor are communicated with the corresponding second three-position four-way valve through the corresponding oil ways. By means of the device for applying force to the multiple points of the steel supporting shaft synchronously, force can be applied to multiple supporting points and points with different force at the same time, the device can be unloaded accurately, and the device has the beneficial effects of being safe, efficient and economical in use.

Description

technical field [0001] The invention relates to the technical field of foundation pit construction devices, in particular to a device for synchronously applying multi-point axial forces of steel supports. Background technique [0002] With the rapid development of underground engineering in my country, there are more and more large-scale deep foundation pit projects along subway lines, elevated roads, tunnels, etc., and steel support systems have gradually become the dominant construction mode of support systems in deep foundation pits, and the demand is increasing. [0003] In China, steel support axial force compensation devices are mainly used to manually adjust the axial force, and safety accidents emerge in endlessly; a few enterprises have begun to use automatic axial force application devices. [0004] The existing automatic axial force application device has the following defects: [0005] 1) When adding axial force, it can only be carried out gradually on a single ...

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Problems solved by technology

[0005] 1) When adding axial force, it can only be carried out gradually on a single support point, and it cannot be applied to multiple support points and points with different forces at the same time. Changes in force; individual support points with large changes in axial force need to be reinforced again, which will affect construction safety, construction efficiency, and construction effect

[0006] 2) When the axial force is added, it can be precisely controlled according to the set value, and the work is safe; when unloading, precise unloading cannot be achieved, and the pressure may drop to 0 instantly, which is extremely unsafe for construction

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